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I believe what you are doing for your Alt text is great - make it describe each image individually.
As for title I would use it to further describe each individual image rather than duplicate for all in the blog post imagery. This is mainly used for further improving UX on each image.
Alt text is the most important from an crawling/seo perspective as is often used in collaboration with the surrounding text to determine context. Be wary of keyword stuffing in your alt tags.
Hope that helps.
You could always trial a service like mention.com - It will allow you to track specific content across a variety of locations including FB and Twitter etc. It is a paid solution, but you can get a free trial.
So people share a specific link or bit link - hopefully you can track it.
I personally use a number of tools, MOZ bing one, Google Search Console, SemRush, and SeoPowersuite.... as for managing my social my personal favourite is Buffer..... where i manage, FB, Twitter, G+, Pinterest, Instagram and LinkedIn.